068  
FXUS01 KWBC 260753  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
352 AM EDT WED SEP 26 2018  
 
VALID 12Z WED SEP 26 2018 - 12Z FRI SEP 28 2018  
 
...SEVERE THUNDERSTORMS POSSIBLE ACROSS THE NORTHEAST ON  
WEDNESDAY, WITH HEAVY TO EXCESSIVE RAINFALL POSSIBLE WEDNESDAY AND  
THURSDAY ACROSS THE SOUTHERN APPALACHIANS...  
 
...WELL BELOW NORMAL TEMPERATURES EXPECTED ACROSS THE SOUTHERN  
PLAINS AND ALSO THE NORTHERN HIGH PLAINS...  
 
WIDESPREAD SHOWERS AND THUNDERSTORMS ARE EXPECTED ALONG A COLD  
FRONT PUSHING INTO THE EASTERN U.S. TODAY. SEVERE THUNDERSTORMS  
AND LOCALLY HEAVY RAINFALL ARE POSSIBLE ALONG THIS BOUNDARY ACROSS  
THE NORTHEAST TODAY, AND THE STORM PREDICTION CENTER HAS  
HIGHLIGHTED MUCH OF THIS AREA WITHIN A MARGINAL TO SLIGHT RISK.  
THE SOUTHERN PORTION OF THIS BOUNDARY IS FORECAST TO STALL FROM  
THE MID-ATLANTIC TO THE CENTRAL GULF COAST, WHICH SHOULD KEEP  
SHOWERS AND STORMS IN THE FORECAST FOR THURSDAY TOO ACROSS THIS  
REGION. HEAVY TO POSSIBLY EXCESSIVE RAINFALL IS POSSIBLE,  
ESPECIALLY FROM THE TENNESSEE VALLEY TO THE SOUTHERN APPALACHIANS,  
WHERE WPC HAS A SLIGHT RISK FOR FLASH FLOODING BOTH WEDNESDAY AND  
THURSDAY. THE BACKSIDE OF THIS FRONT FEATURES A RATHER CHILLY  
AIRMASS FOR THIS TIME OF THE YEAR, WITH DAYTIME HIGH TEMPERATURES  
AS MUCH AS 10 TO 20+ DEGREES BELOW NORMAL EXPECTED ACROSS THE  
SOUTHERN PLAINS STATES ON WEDNESDAY.  
 
ANOTHER COLD FRONT DIPS INTO THE NORTHERN TIER STATES BY THURSDAY,  
WITH SCATTERED SHOWERS EXPECTED ALONG THE BOUNDARY FROM THE UPPER  
GREAT LAKES TO THE NORTHERN ROCKIES. THIS FRONT ALSO BRINGS IN A  
REINFORCING SHOT OF COLD CANADIAN AIR WHICH MAY ALLOW FOR SNOW TO  
MIX IN ACROSS THE HIGHER ELEVATIONS. TEMPERATURES ACROSS THE  
NORTHERN HIGH PLAINS COULD BE 10 TO 15 DEGREES BELOW NORMAL BY  
THURSDAY. MEANWHILE OUT WEST, UPPER LEVEL RIDGING HOLDS STRONG  
THROUGH FRIDAY WHICH MEANS CONDITIONS REMAIN WARM AND DRY. AN  
ELEVATED FIRE WEATHER THREAT CONTINUES AS WELL, ESPECIALLY FOR  
PORTIONS OF THE CENTRAL ROCKIES AND NORTHERN CALIFORNIA, WHERE A  
HANDFUL OF RED FLAG WARNINGS ARE IN EFFECT.  
 
SANTORELLI  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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